The section setting the case
initialization discussed starting a new case as a branch run or
hybrid run by using data from a previous run. First you need to create
a new case. Assume that $
CCSMROOT is set to /user/ccsmroot and that
EXEROOT is /ptmp/$user/b40.B2000p. Finally,
assume that the branch or hybrid run is being carried out on NCAR's
IBM system, yellowstone.
> cd /user/ccsmroot/scripts > create_newcase -case ~/cesm1/b40.B2000p \ -compset B_2000 \ -res 0.9x1.25_gx1v6 \ -mach yellowstone > cd ~/cesm1/b40.B2000p
For a branch run, modify env_conf.xml to branch from b40.B2000 at year 0001-02-01.
> xmlchange -file env_conf.xml -id RUN_TYPE -val branch > xmlchange -file env_conf.xml -id RUN_REFCASE -val b40.B2000 > xmlchange -file env_conf.xml -id RUN_REFDATE -val 0001-02-01
For a hybrid run, modify env_conf.xml to start up from b40.B2000 at year 0001-02-01.
> xmlchange -file env_conf.xml -id RUN_TYPE -val hybrid > xmlchange -file env_conf.xml -id RUN_REFCASE -val b40.B2000 > xmlchange -file env_conf.xml -id RUN_REFDATE -val 0001-02-01
For a branch run, env_conf.xml for b40.B2000p should be identical to b40.B2000, except for the $RUN_TYPE setting. In addition, any modifications introduced into ~/cesm1/b40.B2000/Buildconf/$component.buildnml.csh, should be re-introduced into b40.B2000p.
Configure and build the case executable.
> configure -case > b40.B200p.yellowstone.build
Prestage the necessary restart/initial data in $RUNROOT (assumed to be /ptmp/$user/b40.B2000p/run). Note that /ptmp/$user/b40.B2000p/run was created during the build. Assume that the restart/initial data is on the NCAR mass store.
> cd /ptmp/$user/b40.B2000br/run > hsi "cd /CCSM/csm/b40.B2000/rest/0001-02-01-00000; get *"
It is assumed that you already have a valid load-balanced scenario. Go back to the case directory, set the job to run 12 model months, use an editor to change the time limit in the run file to accommodate a 12-month run, then submit the job.
> ~/cesm1/b40.B2000p > xmlchange -file env_run.xml -id STOP_OPTION -val nmonths > xmlchange -file env_run.xml -id STOP_N -val 12 > # use an editor to change b40.B2000.yellowstone.run "#BSUB -W 1:30" to "#BSUB -W 6:00" > bsub < b40.B2000p.yellowstone.run
Verify that the run succeeded.
> grep "SUCCESSFUL TERMINATION" poe.stdout.*
Change the run to a continuation run. Set it to resubmit itself 10 times so that it will run a total of 11 years (including the initial year), then resubmit the case.
> xmlchange -file env_run.xml -id CONTINUE_RUN -val TRUE > xmlchange -file env_run.xml -id RESUMIT -val 10 > bsub < b40.B2000p.yellowstone.run